Several invalid HTTPS certificates were placed on the certificate blacklist to prevent their misuse. Users on a compromised network could be directed to sites using the fraudulent certificates and mistake them for the legitimate sites. This could deceive them into revealing personal information such as usernames and passwords. It may also deceive users into downloading malware if they believe it's coming from a trusted site. The NSS and NSPR packages were updated to the latest versions as well as the rootcerts packages providing the latest root CA certs from mozilla as of 2011/03/23. The firefox packages were updated to the latest 3.6.16 version which is not vulnarable to this issue. The mozilla thunderbird 3.1.9 packages were patched with the same fix as of firefox as a precaution. Packages for 2009.0 are provided as of the Extended Maintenance Program